School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China
Copyright © 2017 Shifeng Wang, Xiaoming Han, Qiangqiang Zhang et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.
How to Cite this Article
Wang, S. , Han, X. and Zhang, Q. (2017) Study of Load Fluctuation Characteristics of PDC Bit during Gas Extraction Borehole in Soft Coal Seam.
Open Access Library Journal,
4, 1-13. doi:
10.4236/oalib.1103693.